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Describe the transponder, forward link and reverse link. Write down the advantages and disadvantages of non-linear amplifier.
Explain the application of satellite for telephone services. Draw the earth station using antenna.
Where do we prefer satellite communication? Write down one disadvantage in comparison to terrestrial link.
Derive SNR for, optical satellite link receiver. Describe the significance of UW detection in TDMA.
Draw and describe block diagram of a satellite transponder. Compare various digital modulation schemes used in satellite communication system.
Describe the four phase PSK detector with block diagram. Explain TDMA super frame. How it is different from simple TDMA frame?
Describe the modern concept of cable transmission network.
Briefly explain the use of tracking and pointing in satellite communication.
Explain shot, thermal noise mechanisms in optical receivers.
Where do you use distributed feedback laser (DFB) structures? What do you mean by Single longitudinal Mode (SLM) laser?
Explain the working and features of tunable semiconductor lasers.
What is the concept of four wave mixing? describe. Describe briefly the characteristics of optical materials.
ompute the refractive indices of the core and the cladding materials of an optical fibre whose NA = 0.35 and Δ = 0.01.
What are the direct band gap and indirect band gap semiconductors? What do you mean by absorption, spontaneous emission and stimulated emission in a two level energy system?
What do you mean by Noise? List and describe different kinds of noises encountered in an optical communication link?
Write down the advantages of using code division multiplexing.
Describe the working principle of DFB laser diodes with appropriate diagram?
Differentiate between RZ and NRZ modulation format. Write down the difference between loose and tight buffer fibers in terms of operation?
Write brief note on optical modulators and their applications. Explain the impact of chirping on modulator performance?
Extrinsic (OH-) absorption peaks define three regions or windows of preferred operation. Write down the three windows of operation?
Explain the modulation response of laser for small-signal modulation. Derive an expression for signal-to-noise ratio in APDs.
Explain principle of MSM photo detectors in detail. Write down the importance of Q factor and how is it related to BER.
Describe the SPM and XPM effect in optical fibers. Derive an expression for receiver sensitivity of an APD.
Write down the difference between material and waveguide dispersion? Explain the principle of operation of laser?
What are the causes of dispersion in single mode fibers? Describe each of them in detail.